Optical curve grinding machine C adjusting mechanism

Abstract

The application discloses an optical curve grinding machine C-shaped adjusting mechanism and relates to the technical field of precision grinding machines.The mechanism comprises a C-shaped fixing base, a moving mechanism and an adjusting mechanism; the C-shaped fixing base is internally provided with a C-shaped guide sliding groove and a rack; the moving mechanism adopts coaxial double-side support structure of a driving gear and a guide pulley, cooperates with a bevel gear transmission to realize stable walking along a C-shaped track; the adjusting mechanism integrates a vertical lifting assembly guided by double sliding rails and a horizontal moving assembly of a rodless cylinder, and realizes composite precision adjustment.The application has the advantages of compact structure, high transmission rigidity, stable operation and no crawling, can realize continuous high-precision grinding of C-shaped or arc-shaped workpieces, effectively solves the problems of traditional mechanism, such as unbalanced load, high gravity center, long transmission chain and poor precision maintenance, and is suitable for the precision machining scene of the optical curve grinding machine.

Description

Technical Field

[0001] This invention relates to the field of precision optical profile grinding technology, and specifically to a high-precision composite adjustment mechanism for C-shaped trajectory suitable for continuous grinding of C-shaped or arc-shaped workpieces. Background Technology

[0002] Optical profile grinding machines are widely used in aerospace, precision molds, medical devices and other fields for high-precision machining of complex curved surface parts; their adjustment mechanism is the core component that ensures grinding accuracy and efficiency.

[0003] The existing grinding machine adjustment mechanism has the following main problems: Poor structural adaptability: It mostly uses linear guides or rotary tables, which are difficult to continuously process C-shaped or arc contours, requiring multiple clamping and easily introducing positioning errors; Insufficient rigidity and stability: The stacking of multiple cross slides results in a high center of gravity and poor rigidity, which makes them prone to vibration and creep under high-speed and heavy-load conditions, affecting machining accuracy; Low transmission accuracy: Arc-shaped mechanisms often use single-sided gear drive or friction drive, which has an off-center overturning moment. With long-term use, the guide surface wears unevenly, the gap increases, and the accuracy drops rapidly. The transmission chain is long: in traditional layouts, the motor is external, there are many transmission links, the structure is loose, and the space utilization rate is low.

[0004] Therefore, the present invention aims to provide a compact, smooth, high-precision, and rigid C-shaped adjustment mechanism for optical profile grinding machines to overcome the shortcomings of the prior art. Summary of the Invention

[0005] This invention proposes a C-shaped adjustment mechanism for an optical profile grinding machine, comprising a C-shaped fixed base, a moving mechanism, and an adjustment mechanism.

[0006] A C-shaped fixing seat is provided with a C-shaped guide groove that runs through its outer circumference. A rack is fixed on one side of the inner wall of the groove along its C-shaped extension trajectory. The moving mechanism includes a mounting base, a drive gear, a guide pulley, a motor, and a bevel gear transmission assembly. The mounting base is slidably disposed within the slide groove. The drive gear meshes with the rack, and the guide pulley rolls against the inner wall of the slide groove. The drive gear and the guide pulley are coaxially arranged and located on opposite sides of the mounting base to form double-sided support. The motor drives the drive gear to rotate via the bevel gear transmission assembly, thereby causing the moving mechanism to travel along the C-shaped guide slide groove. An adjustment mechanism, mounted on the mounting base, includes a vertical lifting assembly and a horizontal moving assembly. The vertical lifting assembly includes a vertically positioned cylinder, a fixed plate, and slide rails and slider guide structures symmetrically arranged on both sides of the cylinder, used to drive the fixed plate to move stably in the vertical direction. The horizontal moving assembly is a rodless cylinder horizontally fixed to the fixed plate, used to achieve reciprocating movement in the horizontal direction. A grinding device, wherein the grinding device is mounted on the movable slide of the rodless cylinder.

[0007] Furthermore, the bevel gear transmission assembly includes a first bevel gear and a second bevel gear. The first bevel gear is coaxially and fixedly connected to the drive gear and the guide pulley, and the second bevel gear is located at the end of the servo motor shaft. The servo motor is equipped with a brake, which can automatically lock into position when the machine stops.

[0008] Furthermore, the cross-section of the slide is convex or dovetail-shaped, which provides anti-detachment restraint and improves motion stability.

[0009] Furthermore, reinforcing ribs are installed on both sides of the servo motor to improve installation rigidity and reduce vibration.

[0010] Furthermore, the vertical lifting assembly is equipped with a support frame, which, together with the slider and the fixed plate, forms a portal support to prevent swaying.

[0011] Furthermore, mechanical limit switches and proximity switches are installed at both ends of the chute to achieve limit protection and origin reset.

[0012] Furthermore, the drive shaft is supported by back-to-back angular contact ball bearings with a coaxiality of no less than IT6 grade to ensure transmission accuracy.

[0013] Furthermore, the gear and rack clearance is adjusted to 0.02mm-0.05mm by using an eccentric bushing, and the slide groove is subjected to high-frequency quenching and a wear-resistant coating to improve service life and precision retention.

[0014] The above-described solution of the present invention has at least the following beneficial effects: 1. Coaxial double-sided support structure eliminates overturning moment, ensuring smooth walking without crawling or uneven wear; 2. The bevel gear reversing layout, with the motor built-in, results in a compact structure, short transmission chain, and high rigidity. 3. The C-shaped integrated slide is suitable for continuous grinding of arc-shaped workpieces, eliminating the need for multiple clamping operations and improving efficiency and accuracy; 4. Dual-rail gantry lifting + rodless cylinder composite adjustment, high positioning accuracy and fast response; 5. Wear-resistant treatment and controllable gap design ensure good precision retention and long service life.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along line AA in the middle;

[0019] Figure 3 This is a schematic diagram of the structure of the fixing base in an embodiment of the present invention;

[0020] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the BB line in the middle;

[0021] Figure 5 This is a schematic diagram of the structure of a rodless cylinder;

[0022] Figure 6 yes Figure 2 Enlarged view of section C in the image;

[0023] Figure 7 yes Figure 4 Enlarged view of part D in the image.

[0024] Explanation of icon numbers:

[0025] 1. Fixed base; 2. Slide groove; 3. Moving mechanism; 4. Adjusting mechanism;

[0026] 101. Gear rack;

[0027] 301. Mounting base; 302. Drive gear; 303. Guide pulley; 304. Cavity; 306. First bevel gear; 307. Motor; 308. Second bevel gear;

[0028] 401. Cylinder; 402. Fixing plate; 403. Slide rail; 404. Slider; 405. Lifting frame; 406. Rodless cylinder.

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," and "radial," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The following describes in detail, with reference to the accompanying drawings, an embodiment of the C-shaped adjustment mechanism for an optical profile grinder according to the present invention.

[0036] Example 1 Please see Figures 1 to 7 This embodiment provides a C-shaped adjustment mechanism for an optical profile grinding machine. The mechanism mainly consists of three parts: a fixed base 1, a moving mechanism 3, and an adjustment mechanism 4.

[0037] Fixed base 1: The fixed base 1 is C-shaped and is made of high-strength gray cast iron HT250, which is then aged to eliminate internal stress and ensure long-term accuracy. It has a C-shaped guide groove 2 machined through its outer circumference. In this embodiment, the groove 2 has a dovetail cross-section. This structure provides mechanical constraint perpendicular to the sliding direction, preventing the moving mechanism 3 from disengaging or overturning during movement. The inner surface of the groove 2 is subjected to high-frequency quenching, achieving a hardness of HRC52-58, and is covered with a wear-resistant titanium carbonitride (TiCN) coating to reduce the coefficient of friction and improve wear resistance. A precision rack 101 extending along a C-shaped trajectory is fixed to one inner wall of the groove 2 by screws. The rack 101 has a precision grade of DIN 6. To prevent grinding dust contamination, an accordion-style dust cover that can extend and retract with the moving mechanism 3 is also installed on the outer circumference of the fixed base 1.

[0038] Moving mechanism 3: Moving mechanism 3 is the core component for realizing movement along a C-shaped trajectory. It includes a mounting base 301, the bottom of which matches the dovetail-shaped cross-section of the slide groove 2 to form a sliding pair. The mounting base 301 has a cavity 304 inside.

[0039] On one side of the mounting base 301, a drive gear 302 is rotatably mounted, meshing with a rack 101. On the other side of the mounting base 301, a guide pulley 303 is rotatably mounted, rolling on the corresponding inner wall of the slide groove 2. Crucially, the drive gear 302 and the guide pulley 303 are coaxially aligned. Specifically, they are mounted on the same drive shaft, which is rotatably supported within the mounting base 301 by a pair of back-to-back mounted P4-grade precision angular contact ball bearings, with the coaxiality tolerance after assembly strictly controlled within 0.02 mm. This coaxial double-sided support structure ensures that the meshing force and the support reaction force are collinear, effectively eliminating off-center loading moments.

[0040] A servo motor 307 with a brake function is vertically fixed inside the cavity 304. A second bevel gear 308 is mounted on the drive shaft of the motor 307. A first bevel gear 306 is fixedly mounted on the section of the drive shaft located inside the mounting base 301. The first bevel gear 306 meshes with the second bevel gear 308 to form a bevel gear transmission assembly. In this embodiment, the transmission ratio of the bevel gear pair is 2:1, and grease lubrication is used. The grease type is Mobilux EP 2. When the motor 307 rotates, it drives the coaxial drive gear 302 to rotate through the bevel gear pair to reduce speed and increase torque, thereby driving the entire mounting base 301 to move smoothly along the C-shaped slide groove 2. To enhance the mounting rigidity of the motor 307, two triangular first reinforcing ribs are symmetrically welded on both sides of it.

[0041] Adjustment mechanism 4: Adjustment mechanism 4 is used to achieve precise positioning of the grinding equipment. It is integrated into the mounting base 301 of the moving mechanism 3.

[0042] The vertical lifting assembly includes a double-acting cylinder 401 vertically fixed within a cavity 304, with a fixed plate 402 connected to the top of the piston rod of cylinder 401. To ensure rigidity and straightness during the lifting process, two sets of precision linear guide rail pairs, consisting of slide rails 403 and sliders 404, are symmetrically arranged on both sides of cylinder 401. The slide rails 403 are vertically secured to the inner wall of cavity 304 with screws. Each slider 404 is fixedly connected to an L-shaped support frame 405, and the tops of the two support frames 405 are connected to the lower end face of the fixed plate 402, forming a stable portal support structure to ensure that the fixed plate 402 does not wobble during the lifting process.

[0043] The horizontal movement component is a rodless cylinder 406, whose body is horizontally fixed to the upper surface of the mounting plate 402 by screws. The moving slide of the rodless cylinder 406 is equipped with a standard mounting interface for fixing various grinding equipment (such as pneumatic grinders, electric grinders, or ultrasonic grinding heads). The rodless cylinder 406 has a rapid response, no mechanical transmission backlash, and can achieve high-frequency, precise horizontal reciprocating motion.

[0044] Control and Safety: Mechanical limit blocks and inductive proximity switches are installed at both ends of the C-shaped slide groove 2 of the fixed base 1, respectively. The proximity switches are connected to the controller of the servo motor 307. When the moving mechanism 3 triggers the proximity switch, the controller will issue commands to decelerate, stop, or reverse the movement, realizing the functions of limit position protection and automatic origin reset. The movements of the motor 307, cylinder 401, and rodless cylinder 406 are all coordinated and controlled by a host CNC (computer numerical control) system.

[0045] Workflow and debugging methods: Assembly and debugging: Install the mounting base 301 with the drive shaft assembly installed into the slide groove 2. Adjust the meshing clearance between the drive gear 302 and the rack 101 to 0.03mm-0.05mm by adjusting the eccentric bushing located on the bearing seat, and then lock it.

[0046] Install the adjustment mechanism 4 and check whether the slide rail 403 and slider 404 slide smoothly without jamming.

[0047] Connect the air circuit and the electrical circuit, and conduct a no-load test run. Check whether the movement of the moving mechanism 3 driven by the motor 307 is smooth within the full length range of the C-shaped slide 2. Use a dial indicator to measure the straightness and repeatability of the lifting and horizontal movement of the fixed plate 402 to ensure that the design specifications are met (positioning accuracy ±0.01mm, repeatability ±0.005mm).

[0048] Grinding process: The C-shaped or arc-shaped workpiece to be processed is clamped on the grinding machine worktable.

[0049] The CNC system generates control commands based on the theoretical contour curve of the workpiece.

[0050] The moving mechanism 3 first carries the adjusting mechanism 4 along the C-shaped slide 2 to the initial grinding arc position of the workpiece.

[0051] Subsequently, the vertical cylinder 401 and the rodless cylinder 406 work together to drive the grinding equipment to approach the workpiece surface.

[0052] After entering the grinding stage, the moving mechanism 3 moves continuously along the C-shaped slide 2 at a preset speed (e.g., 200 mm / s). At the same time, the rodless cylinder 406 performs high-frequency micro-motion compensation according to the contour error, while the vertical cylinder 401 feeds in stages according to the grinding allowance.

[0053] After completing the grinding of one arc segment, the moving mechanism 3 can continue to travel along the C-shaped trajectory to the next arc segment, or travel in the opposite direction to perform reciprocating grinding, until the entire C-shaped contour surface is processed.

[0054] Interference avoidance scheme: During the design phase, three-dimensional simulation was used to ensure that the adjusting mechanism 4 does not interfere with the fixed base 1 at the extreme positions of lifting and lateral movement. In addition, the cables and air pipes connecting the motor 307 and cylinder 401 are all in the form of flexible cable chains, arranged along the C-shaped outer edge of the fixed base 1 to accommodate the reciprocating motion of the moving mechanism 3 and ensure that the cables do not become entangled or stretched and damaged when moving.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A C-shaped adjustment mechanism for an optical profile grinding machine, characterized in that, include: The C-shaped fixing seat has a C-shaped guide groove that runs through the outer circumference of the fixing seat, and a rack is fixed on one side of the inner wall of the groove along the C-shaped extension trajectory; The moving mechanism includes a mounting base, a drive gear, a guide pulley, a servo motor, and a bevel gear transmission assembly. The drive gear meshes with a rack, and the guide pulley rolls against the inner wall of the slide groove. The drive gear and the guide pulley are coaxially arranged and located on both sides of the mounting base to form double-sided support. The servo motor drives the drive gear to rotate through the bevel gear transmission assembly, thereby driving the moving mechanism to move along the C-shaped guide slide groove. An adjustment mechanism, mounted on a mounting base, includes a vertical lifting assembly and a horizontal moving assembly; the vertical lifting assembly includes a vertical cylinder, a symmetrically arranged double slide rail slider guide structure, and a fixed plate; the horizontal moving assembly is a rodless cylinder horizontally fixed to the fixed plate. The grinding equipment is mounted on a movable slide of a rodless cylinder.

2. The C-shaped adjustment mechanism for the optical profile grinding machine according to claim 1, characterized in that, The bevel gear transmission assembly includes a first bevel gear and a second bevel gear; the first bevel gear is coaxially and fixedly connected to the drive gear and the guide pulley, and the second bevel gear is fixedly mounted on the drive shaft of the servo motor and meshes with the first bevel gear; the servo motor is a servo motor with a brake function.

3. The C-shaped adjustment mechanism for the optical profile grinding machine according to claim 1, characterized in that, The cross-section of the C-shaped guide groove is convex or dovetail-shaped to provide anti-detachment constraint perpendicular to the sliding direction.

4. The C-shaped adjustment mechanism for the optical profile grinding machine according to claim 1, characterized in that, The moving mechanism also includes first reinforcing ribs located on both sides of the servo motor. One end of the first reinforcing rib is fixedly connected to the servo motor housing, and the other end is fixedly connected to the inner wall of the mounting base to improve the motor mounting rigidity.

5. The C-shaped adjustment mechanism for the optical profile grinding machine according to claim 1, characterized in that, The vertical lifting assembly also includes two lifting frames. The lower ends of the two lifting frames are fixedly connected to two sliders, and the upper ends are fixedly connected to the lower end face of the fixed plate, forming a portal support structure.

6. The C-shaped adjustment mechanism for the optical profile grinding machine according to claim 1, characterized in that, The fixed base is equipped with mechanical limit blocks and proximity switches at both ends of the slide. The proximity switches are electrically connected to the servo motor control system and are used to limit the extreme positions of the moving mechanism and trigger the origin reset signal.

7. The C-shaped adjustment mechanism for the optical profile grinding machine according to claim 2, characterized in that, The drive gear, guide pulley, and first bevel gear are mounted on the same drive shaft; the drive shaft is supported in the mounting base by a pair of back-to-back angular contact ball bearings with a coaxiality tolerance grade of not less than IT6.

8. The C-shaped adjustment mechanism for the optical profile grinding machine according to claim 1, characterized in that, The clearance between the drive gear and the rack is adjusted to 0.02mm-0.05mm by the eccentric bushing; the inner surface of the slide groove is treated with high frequency quenching and covered with a wear-resistant coating.

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